2020-01-21T10:50:49.1283745Z ======================================================================
2020-01-21T10:50:49.1283887Z ERROR: test_unset_error (test.test_os.EnvironTests)
2020-01-21T10:50:49.1284029Z ----------------------------------------------------------------------
2020-01-21T10:50:49.1284166Z Traceback (most recent call last):
2020-01-21T10:50:49.1284296Z File "D:\a\cpython\cpython\lib\test\support\__init__.py", line 695, in wrapper
2020-01-21T10:50:49.1284429Z return func(*args, **kw)
2020-01-21T10:50:49.1284504Z File "D:\a\cpython\cpython\lib\test\test_os.py", line 962, in test_unset_error
2020-01-21T10:50:49.1284628Z self.assertRaises(ValueError, os.environ.__delitem__, key)
2020-01-21T10:50:49.1284764Z File "D:\a\cpython\cpython\lib\unittest\case.py", line 799, in assertRaises
2020-01-21T10:50:49.1284895Z return context.handle('assertRaises', args, kwargs)
2020-01-21T10:50:49.1285989Z File "D:\a\cpython\cpython\lib\unittest\case.py", line 202, in handle
2020-01-21T10:50:49.1286157Z callable_obj(*args, **kwargs)
2020-01-21T10:50:49.1286268Z File "D:\a\cpython\cpython\lib\os.py", line 691, in __delitem__
2020-01-21T10:50:49.1286377Z raise KeyError(key) from None
2020-01-21T10:50:49.1295463Z KeyError: